From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Comparison table of specifications for various shunt dynamos.
| Identifier | ExFiles\Box 37\2\ scan 108 | |
| Date | 28th May 1925 | |
| X.294 SHUNT DYNAMO TABLES [COLUMN HEADERS] COL 1: X.32.32, SAV, MEG.R.K, AS SHUNT COL 2: X.295, SAV, SMITH.A, AS SHUNT COL 3: X.295, SMITH. S.D., AS SHUNT COL 4: X.794, Bose COL 5: X.3306, LIBERTY COL 6: X.3388, R.R. COL 7: X.1005, ROT(AX), AT ID, DERBY No. COL 8: X.4030, U.S.A, AS SHUNT COL 9: X.3766, WESTINGHOUSE COL 10: X.4290, SCINTILLA COL 11: X.4856, R.BOSCH COL 12: X.5106, B.L.I.C., M.1614 [TABLE DATA] ROW: DYNAMO ROW: WEIGHT IN LBS ROW: COMPLETE MACHINE WITH PULLEY BUT WITHOUT SUSPENSION: 36, 32.0, 33.8, 37.0, 11.7, 20.8, 27.0, 21.4, 30.7, 29.1, (with pulley) 27.4, (without pulley) 28.5 ROW: ARMATURE COMPLETE WITHOUT PULLEY: 9.5, 9.5, 9.9, 9.4, 3.0, 7.3, 11.5, 7.2, 10.8, 8.9, 10 1/8, 8.3 ROW: BARE WEIGHT OF CARCASE AND POLE PIECES: 16.25, —, 16.2, 16.25, 4.0, —, —, —, —, —, —, — ROW: WEIGHT OF ARMATURE STAMPINGS: 4.25, —, 4.87, 5.37, 1.44, —, —, —, —, —, —, — ROW: WEIGHT OF ARMATURE COPPER (EXCLUSIVE OF COMMUTATOR): —, —, 1.87, 1.7, .50, —, —, —, —, —, —, — ROW: WEIGHT OF FIELD COPPER: 4.25, —, 3.43, 3.8, 1.06, —, —, —, —, —, —, — ROW: AIR GAP ROW: Mm.: .625, .81, .51, .23, .33, .38, .508, .508, .34, .99, .43, .4125 ROW: INCHES: .025, .032, .020, .009, .013, .015, .020, .020, .0135, .039, .017, .01625 ROW: FIELD CIRCUIT ROW: NUMBER OF WOUND POLES: 2, 2, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4 ROW: DIAMETER OF WIRE, NEAREST S.W.G., INSULATION: (.041 19SWG DCC), (—), (.040 19SWG SCC), (.048 18SWG DCC), (.032 21SWG SSC), (.040 19SWG SSC), (.036 20SWG SSC), (.031 21 SWG), (—), (—), (—), (—) ROW: NUMBER OF TURNS PER COIL: 495, —, 285, 604, 145, 195, —, —, —, —, ALL, ALL ROW: ARRANGEMENT OF COILS: IN SERIES, IN SERIES, IN SERIES, IN SERIES, ALL IN SERIES, ALL IN SERIES, ALL IN SERIES, ALL IN SERIES, ALL IN SERIES, ALL IN SERIES, ALL IN SERIES, ALL IN SERIES ROW: RESISTANCE OF FIELD CIRCUIT (COLD 15°C (18°)) (Ω): 5.2, 4.0, 4.3, 4.0 AT 22°C, 4.1 AT 20°C, 2.6, 1.81, 0.5, 10.7, 4.6, 6.0, 8.5 ROW: ARMATURE CIRCUIT ROW: TYPE OF WINDING, DIA. OF WIRE, NEAREST S.W.G. INSULATION: PROG LAP, RETROG LAP, PROG LAP, RETROG WAVE, RETROG WAVE, RETROG WAVE, RET WAVE, RETROG WAVE, RETROG WAVE, —, RETROG WAVE, WAVE ROW: NUMBER OF SLOTS (S): 24, 19, 19, 12, 21, 29, 14, 17, 25, 18, 20, 15 ROW: NUMBER OF CONDUCTORS (N): 672, 760, 684, 480, 462, 464, 672, —, —, —, —, — ROW: CONDUCTORS PER SLOT (N/S): 28, 40, 36, 40, 22, 16, 48, —, —, —, —, — ROW: COILS PER SLOT (C/S): 2, 2*, 2, 3, 1, 1, 2, —, 1, 3, 2, 3 ROW: NUMBER OF COILS OR COM. BARS (C): 48, 38, 38, 36, 21, 29, 28, 33, 25, 48, 39, 45 ROW: TURNS PER COIL (N/2C): 7, 10, 9, 5,7,&8, 11, 8, 12, —, 6, —, —, — ROW: VIRTUAL CONDUCTORS (Zc): 96, 76, 76, 72, 42, 58, 56, 66, 50, 90, 78, 90 ROW: WINDING PITCH IN VIRTUAL CONDUCTORS (Z): (1&FORD 33, 1&BACKD 35), (33 FORD, 35 BACKD), (29 FORD, 27 BACKD), (1&9, 12+1=23, 10+1=21), (1&9), (15&13), (—), (13&11), (—), (25&21), (—), (—) ROW: STEP OR WINDING PITCH IN SLOTS: (1&8 (1TO9)), (1&8 (1TO9)), (1&8 (1TO9)), (5 Y=+57, 5 Y=+7), (1&7 (1TO8)), (1&7 (1TO8)), (7, Y=±3 COILS (+4COM BARS)), (1&5 (1TO6)), (1&7 (1TO8)), (—), (3&4), (—) ROW: ARMATURE RESISTANCE (COLD) (OHMS): .46, .685, .58, .51 AT 22°C, .40 AT 22°C, .37, .418, .17, .18, .327, .26, .233 ROW: CONDUCTOR DIMENSIONS: (18 SWG DCC), (.041 19SWG), (.041 19SWG), (.045 18SWG DCC), (.033 21SWG), (.040 19SWG), (.041 19SWG), (—), (—), (—), (—), (.041 19SWG) ROW: COMMUTATOR AND BRUSHES ROW: COMMUTATOR DIAMETER (INS): 1.90, 2.0, 2.05, 1.77, 1.25, 2.10, 2.10, 1.97, 1.97, 1.93, 1.85, 2.10 ROW: COMMUTATOR LENGTH (INS): .78, 1.00, 1.00, .94, .60, .325, .80, 1.00, .95, .975, 1.05, 1.02 ROW: BRUSH CONTACT AREA: (1x.60"x.25"=.15sq"), (1x.75"x.375"=.28sq"), (1x.75"x.375"=.28sq"), (2x.274x.313"=.170sq"), (1x.35"x.225"=.078sq"), (1x.735"x.395"=.28sq"), (2x.62x.31=.385sq"), (1x.735"x.375"=.28sq"), (2x.62x.31"=.38sq"), (2x.492"x.31"=.304"sq"), (1x.835"x.35"=.30"sq"), (1x.45"x.45"=.206"sq") ROW: GRADE AND HARDNESS OF BRUSHES: (C.A.V. METALLIC), (C.M. ITE), (E.G. GRAPHITIC MORGANITE), (L.F. ELECTRO GRAPHITIC. C.2. VERY SOFT), (C.M.3. MORGAN-ITE), (PARKIN CLOSELY RESEMBLES Z(c) HARD), (MORGANITE CARBON. C.4. HARD GRAPHITE), (MORGANITE HARD GRAPHITE), (MORGANITE HM{Capt. W. Hallam - Head Repairs}6 HARD GRAPHITE), (MORGANITE E43 HARD GRAPHITE), (MORGANITE VERY SOFT), (RESEMBLES Graphite Classify LFC2 very soft, Morganite A.5) [FOOTER] NOTE. ALL MACHINES ARE 12 VOLT EXCEPT THE LIBERTY WHICH IS 8 VOLT (TABLE REVISED TO 4-7-23) | ||